Notice setText() has a second parameter "UTF-8". That is pointless in this example, but very important if you are creating the text string from input from a Flow form. Without it, all double-byte input would be converted to question marks ('?':hex 73) and lost forever. With the setting, you can use something like:
"NAME: " + model.name + "\n" + model.comment

2. Change the mail server (twice) and the To and From addresses. HINT: Search for "example.com".